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authorChristoph Hellwig <hch@lst.de>2014-04-16 17:07:22 +0400
committerTrond Myklebust <trond.myklebust@primarydata.com>2014-05-29 01:50:08 +0400
commitfab5fc25d230edcc8ee72367e505955a2fae0cac (patch)
treeea5d0df777acfeef50068c4b031bb9417be9743f /fs/nfs/read.c
parenta20c93e3160e37ecccc738d8eef085c8507949ed (diff)
downloadlinux-fab5fc25d230edcc8ee72367e505955a2fae0cac.tar.xz
nfs: remove ->read_pageio_init from rpc ops
The read_pageio_init method is just a very convoluted way to grab the right nfs_pageio_ops vector. The vector to chose is not a choice of protocol version, but just a pNFS vs MDS I/O choice that can simply be done inside nfs_pageio_init_read based on the presence of a layout driver, and a new force_mds flag to the special case of falling back to MDS I/O on a pNFS-capable volume. Signed-off-by: Christoph Hellwig <hch@lst.de> Tested-by: Anna Schumaker <Anna.Schumaker@Netapp.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Diffstat (limited to 'fs/nfs/read.c')
-rw-r--r--fs/nfs/read.c19
1 files changed, 14 insertions, 5 deletions
diff --git a/fs/nfs/read.c b/fs/nfs/read.c
index 411aedda14bb..7f87461be3a9 100644
--- a/fs/nfs/read.c
+++ b/fs/nfs/read.c
@@ -24,6 +24,7 @@
#include "internal.h"
#include "iostat.h"
#include "fscache.h"
+#include "pnfs.h"
#define NFSDBG_FACILITY NFSDBG_PAGECACHE
@@ -114,11 +115,17 @@ int nfs_return_empty_page(struct page *page)
}
void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
- struct inode *inode,
+ struct inode *inode, bool force_mds,
const struct nfs_pgio_completion_ops *compl_ops)
{
- nfs_pageio_init(pgio, inode, &nfs_pageio_read_ops, compl_ops,
- NFS_SERVER(inode)->rsize, 0);
+ struct nfs_server *server = NFS_SERVER(inode);
+ const struct nfs_pageio_ops *pg_ops = &nfs_pageio_read_ops;
+
+#ifdef CONFIG_NFS_V4_1
+ if (server->pnfs_curr_ld && !force_mds)
+ pg_ops = server->pnfs_curr_ld->pg_read_ops;
+#endif
+ nfs_pageio_init(pgio, inode, pg_ops, compl_ops, server->rsize, 0);
}
EXPORT_SYMBOL_GPL(nfs_pageio_init_read);
@@ -147,7 +154,8 @@ int nfs_readpage_async(struct nfs_open_context *ctx, struct inode *inode,
if (len < PAGE_CACHE_SIZE)
zero_user_segment(page, len, PAGE_CACHE_SIZE);
- NFS_PROTO(inode)->read_pageio_init(&pgio, inode, &nfs_async_read_completion_ops);
+ nfs_pageio_init_read(&pgio, inode, false,
+ &nfs_async_read_completion_ops);
nfs_pageio_add_request(&pgio, new);
nfs_pageio_complete(&pgio);
NFS_I(inode)->read_io += pgio.pg_bytes_written;
@@ -654,7 +662,8 @@ int nfs_readpages(struct file *filp, struct address_space *mapping,
if (ret == 0)
goto read_complete; /* all pages were read */
- NFS_PROTO(inode)->read_pageio_init(&pgio, inode, &nfs_async_read_completion_ops);
+ nfs_pageio_init_read(&pgio, inode, false,
+ &nfs_async_read_completion_ops);
ret = read_cache_pages(mapping, pages, readpage_async_filler, &desc);